Maytag Microwave Error Code Error 3

Error 3 on the Maytag MMC5080AA microwave means the sensor output did not drop below 4.7 volts within 3 minutes during the cooling phase after a cook cycle. The control board monitors this voltage to confirm the sensor is returning to a normal idle state. When the voltage stays too high for too long, the oven stops operation and displays this error. It can indicate a sensor fault, a wiring issue, or simply that the oven needed more cool-down time.

It is not recommended to continue using the microwave while this error is active. The error indicates the oven's sensor monitoring system detected an out-of-range condition, and continuing to operate it could mask a developing component failure. Allow the oven to cool fully and reset it before attempting further use. If the error returns immediately, stop using the unit until the cause is diagnosed.

If the repair only requires a cooling or humidity sensor replacement, parts typically cost in the range of $20 to $60 depending on availability, and a technician visit to perform the replacement could add $75 to $150 in labor. If the control board is the cause, parts alone can run $100 to $250 or more, making professional repair costs higher. In some cases, particularly on older units, a repair estimate may approach the cost of replacement, which is worth factoring into the decision.

The first step you can try yourself is allowing the microwave to cool completely for at least 5 minutes, then resetting it by unplugging it from the wall for a minute before plugging it back in. If the error returns, inspecting the wiring harness connected to the sensor is a reasonable next step for someone comfortable with basic appliance disassembly. Replacing the sensor itself is also a DIY-level repair in many cases, but working inside a microwave requires caution due to the high-voltage capacitor, which can hold a dangerous charge even when unplugged.

A reset may clear the error temporarily, especially if the root cause was simply that the oven had not cooled down enough. To reset, unplug the microwave from the outlet for about one minute, then plug it back in. If the error reappears after a normal cooking cycle, the reset alone is not a fix and a component issue such as a faulty sensor or wiring problem should be investigated.